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- W1567754121 abstract "The δ epithelial sodium channel (δENaC) is a proton-activated, sodium-selective, amiloride-sensitive ion channel in the ENaC/degenerin family of ion channels involved in blood pressure regulation and mechanosensation. Other ENaC family members are subject to ubiquitin modification leading to internalization from the cell surface, and degradation of the channel. Here, we show that δENaC is also modified by ubiquitin on three intracellular lysine residues. Absence of these lysines abolished ubiquitin modification of δENaC and increased cell surface levels of δENaC. Although the HECT-domain ubiquitin ligase Nedd4-2 reduced amiloride-sensitive current generated by δβγENaC-containing channels, δENaC does not contain a binding site for Nedd4-2; therefore, this effect is probably mediated by the βγENaC subunits. Nedd8, a ubiquitin-like protein that regulates RING-domain E3 ubiquitin ligases, promoted δENaC ubiquitination, decreased both the intracellular and cell surface δENaC populations, and decreased δβγENaC amiloride-sensitive short circuit current (Isc-amiloride) in a mammalian epithelium. Nedd8 also promoted α− and γENaC ubiquitination, decreased the cell surface pools, and decreased αβγENaC Isc-amiloride. Conversely, XIAP, a single subunit RING E3 ligase, decreased ubiquitinated δENaC, increased the δENaC cell surface pool and increased δβγENaC Isc-amiloride. Therefore δ− and α − βγENaC channel function may be influenced by RING-domain E3 ubiquitin ligases. J. Cell. Physiol. 228: 2190–2201, 2013. © 2013 Wiley Periodicals, Inc." @default.
- W1567754121 created "2016-06-24" @default.
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- W1567754121 date "2013-07-25" @default.
- W1567754121 modified "2023-10-16" @default.
- W1567754121 title "Regulation of the delta and alpha epithelial sodium channel (ENaC) by ubiquitination and Nedd8" @default.
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- W1567754121 doi "https://doi.org/10.1002/jcp.24390" @default.
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